<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var age1 = 20;
    var age2 = "20";
    //alert(age1 == age2);
    alert(age1 === age2);
</script>
</body>
</html>